humanmade/Custom-Metaboxes-and-Fields-for-WordPress — comment on commit e565509f65a3bdd5c39d430fd80215e4d2d01160
File:  line 0
By willmot:

Agree re. doing escaping as late as possible, `esc_url` should be moved into the input value attribute.

I do think text_url would be useful though, as the url is sanitized (`http://` is prepended) and the input has `class="code"` which is inline with the WordPress style for inputs that accept a url.